Q: Heater blows cold air on 1992 GMC Yukon

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
Is there a heater water control valve and how do I replace/check it? Where is it?
(1) Answer
First of all, make sure the coolant level is OK, and the engine is reaching normal operating temperature.

Your vehicle has a temperature blend door, and it is activated by a little electric motor called an actuator. Check out for instructions!
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